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GM137-1405-8 – Bombardier OEM Right-Hand Aerodynamic Side Seal
Available now on the Airparts.aero Marketplace.
The GM137-1405-8 is a precision-engineered, high-performance aerodynamic seal designed specifically for the right-hand (RH) side of the fuselage, engine pylon, or nacelle interface on Bombardier Challenger and Global series aircraft. As the direct "mirrored" counterpart to the -7 (LH) seal, the -8 configuration is critical for maintaining symmetrical laminar airflow across the aircraft’s airframe. By bridging the mechanical gaps between structural panels and moving fairings, this seal eliminates "parasitic drag" and prevents the acoustic "whistling" or vibration often caused by high-velocity air entering airframe cavities at Mach speeds.
Constructed from a specialized reinforced fluorosilicone elastomer, the GM137-1405-8 is built to withstand the punishing environment of long-range turbine flight. It remains highly flexible at the cryogenic temperatures found at FL450 (–55°C) while resisting the intense "soak-back" heat near engine nacelles. Its primary function is to provide an environmental and aerodynamic barrier, protecting sensitive internal components from moisture, ice, and chemical ingress.
Key Features
Precision Right-Hand (RH) Geometry: Molded to the specific contours of the right-side airframe stations, ensuring a flush, "zero-step" transition between skin panels.
Reinforced Matrix Construction: Features an internal polyester or fiberglass mesh "scrim" that prevents the seal from stretching or "ballooning" under the high-pressure differentials of a pressurized cabin.
Fluid-Resistant Elastomer: Specifically formulated to resist swelling or degradation when in contact with Skydrol (LD-4/5), Jet-A1, and aggressive Type IV anti-icing fluids.
Low-Friction Surface Treatment: Often coated with a specialized PTFE (Teflon) or dry-film lubricant to allow adjacent metal panels to slide over the seal without "binding" or "chattering."
UV and Ozone Stabilized: Engineered to resist the intense solar radiation at high altitudes, preventing the "chalking" and "cracking" that leads to seal erosion.
Technical Specifications
Part Number: GM137-1405-8
Manufacturer: Bombardier Aerospace (OEM)
Component Type: RH Aerodynamic Side Seal / Pylon Fairing Seal
Material: Reinforced Fluorosilicone / Silicone
Position: Right-Hand (RH) Side Only
Color: Typically Dark Grey or Off-White (Material Dependent)
Certification: FAA-PMA / EASA Form 1 (with OEM Traceability)
Compliance: Bombardier BAMS specification for aerodynamic seals.
Aircraft Compatibility
Bombardier Challenger Series: 604, 605, 650.
Bombardier Global Series: 5000, 6000 (Express/XRS).
Note: The -8 seal is position-specific. Always verify your aircraft's station number in the Illustrated Parts Catalog (IPC) Section 53 (Fuselage) or Section 71 (Powerplant) to confirm this is the correct seal for the RH pylon-to-fuselage or cowling-to-pylon interface.
Specifically For:
- Global 5000
- Global 5500
- Global 6000
- Global 6500
- Global Express
- Global Express Extended Range
- Global Vision G5000
Applications
The GM137-1405-8 is utilized for Boundary Layer Control and Weather-Sealing. Its primary roles include:
Nacelle-to-Pylon Interface: Closing the gap between the engine housing and the pylon to maintain engine cooling efficiency and reduce drag.
Fairing Transitions: Providing a smooth aerodynamic "bridge" over flap track fairings or access panels on the RH side.
Moisture Exclusion: Acting as a "Gutter Seal" to prevent water and de-icing fluid from pooling in structural "V-grooves" where it could cause hidden corrosion.
Why Choose GM137-1405-8?
Choosing a genuine Bombardier GM137-1405-8 is essential for Fuel Efficiency and Noise Reduction. An improperly fitted or "generic" seal can create "flow separation" at high speeds, which increases the Drag Coefficient ($C_d$) and forces the engines to burn more fuel to maintain cruise velocity. Furthermore, the GM137-1405-8 is designed with a specific Durometer (Hardness) that provides the perfect balance between a tight seal and mechanical flexibility, ensuring it does not "delaminate" or "peel" away from the airframe under the shear forces of transonic flight.
The GM137-1405-8 functions on the principle of Laminar Flow Continuity. In high-speed aviation, any "gap" or "step" in the fuselage creates a Turbulent Wake, which generates drag. The seal is engineered to maintain the Reynolds Number ($Re$) profile across the panel transition, ensuring the boundary layer remains attached. The physics of the seal’s Compression Set are vital; it must retain its "spring-back" force throughout the fuselage's expansion/contraction cycles ($P_{cabin}$ vs $P_{ambient}$). This is achieved via the reinforced silicone matrix, which provides the Tensile Strength required to withstand the high-velocity "scouring" effect of the slipstream.
Note: This is a flight-critical aerodynamic component. Prior to installation, the mounting area must be "surgical-clean," free of old sealant and oils. Use only the specific Bombardier-approved bonding agent (e.g., 3M 1300L) or hardware. Do not over-compress the seal during installation. Inspect for "lifting" or "fraying" during every pre-flight walkaround, as a loose seal can be ingested into the engine intake.
